Answer:
C.$37810
Step-by-step explanation:
Based on the information given we were told that the related Allowance for Doubtful Accounts has $1990 credit balance in which aging it was estimated that $39800 of the December 31 receivables will be uncollectible which means that The necessary adjusting Journal entry would include a credit to the allowance account for $37810 calculated as;
Allowance account=Uncollectible receivables-Allowance for Doubtful Accounts
Allowance account=$39800-$1990
Allowance account=$37810